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| Format: | Preprint |
| Publié: |
2026
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| Accès en ligne: | https://arxiv.org/abs/2604.05746 |
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| _version_ | 1866911572198162432 |
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| author | Parker, William |
| author_facet | Parker, William |
| contents | SNO+ is a multipurpose liquid-scintillator neutrino detector located 2 km underground at SNOLAB, Canada. Three large nuclear reactors at baselines of 240-350 km allow a precise measurement of the neutrino oscillation parameter $Δm^2_{21}$ and, to a lesser extent, $θ_{12}$. A spectral analysis is performed, simultaneously fitting $Δm^2_{21}$, $θ_{12}$, the reactor antineutrino flux, background rates, and associated systematics. Using data collected between May 2022 and July 2025, corresponding to a livetime of 685 days, a value of $Δm^2_{21} = (7.93^{+0.21}_{-0.24}) \times 10^{-5}$ eV$^2$ is obtained. This result is compatible with other long-baseline reactor antineutrino measurements by KamLAND and JUNO. SNO+ has also made the first measurement of the geoneutrino flux in the Western Hemisphere, measuring $49^{+13}_{-12}$ TNU, in agreement with predictions from geological models. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2604_05746 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Reactor Antineutrino Oscillations and Geoneutrinos in SNO+ Parker, William High Energy Physics - Experiment SNO+ is a multipurpose liquid-scintillator neutrino detector located 2 km underground at SNOLAB, Canada. Three large nuclear reactors at baselines of 240-350 km allow a precise measurement of the neutrino oscillation parameter $Δm^2_{21}$ and, to a lesser extent, $θ_{12}$. A spectral analysis is performed, simultaneously fitting $Δm^2_{21}$, $θ_{12}$, the reactor antineutrino flux, background rates, and associated systematics. Using data collected between May 2022 and July 2025, corresponding to a livetime of 685 days, a value of $Δm^2_{21} = (7.93^{+0.21}_{-0.24}) \times 10^{-5}$ eV$^2$ is obtained. This result is compatible with other long-baseline reactor antineutrino measurements by KamLAND and JUNO. SNO+ has also made the first measurement of the geoneutrino flux in the Western Hemisphere, measuring $49^{+13}_{-12}$ TNU, in agreement with predictions from geological models. |
| title | Reactor Antineutrino Oscillations and Geoneutrinos in SNO+ |
| topic | High Energy Physics - Experiment |
| url | https://arxiv.org/abs/2604.05746 |